specification Movement Calibre Breitling B04 (Manufacture) Movement Automatic Power reserve: 70 hours or more Chronograph 1/4 sec., 30 min., 12 Hour Frequency: 28,800 times/hour Number of stones: 47 Calendar Date Display Window case Case Material: Stainless Steel Caseback screw-in (sapphire crystal) Water resistance: 3 ATM Bezel Two-way rotating bezel, Rotation slide rule Crown non-screw-in locking, 2 gaskets Glass, domed, double-sided, non-reflective, coated sapphire crystal size Product weight (approx.) 140.0 g. Watchhead weight (approx.) 117.4 g. Diameter: 48.0 mm Thickness: 15.7 mm Height (lug from top tip to bottom tip) 55.5 mm Lug width between lugs: 24.0 mm Straps/Bracelets Strap Material: Calfskin Leather Strap Color: Black Strap Type: Straight Strap size: 24/20 mm Buckle Material: Stainless Steel Buckle hole closure Buckle size: 20 mm